This is what you do:
Click on the Edit Html as you are writing your post.
Put in front of the text that you want the line to go through.
Put behind it. The backslash is very important.
Thus, when you click on the Edit Html tab, this is how the above sentence will look.
Why must should I have strikethroughs in my blog?
WOW!Isn't this real cool!Well, go around playing with strikethroughs in your blogs!:)